Improvement in electric lamps



N. B. GANTT. Electric-Lamp.

No. 218,958. Patented Aug. 26,1879.

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INVENTQR BY A ATTORNEYS.

WITNESSES 1 .l. PETERS PHOTQLITHQGRAPMER UNITED STATES PATENT OEEIoE.

NORBORNE B. GANTT, OF LOUISVILLE, KENTUCKY.

IMPROVEMENT IN ELECTRIC LAM PS.

Specification forming part of Letters Patent No. 218,958, dated August26, 1879 application filed March 18, 1879.

To all whom it may concern:

Be it known that I, NORBORNE B. GANTT, of Louisville, in the county ofJefferson and State of Kentucky, have invented a new and ImprovedElectric Lamp, of which the following is a specification.

The object of my invention is to furnish a simple, durable, and cheapelectric light, adapted for use either as a hanging or stand ard lamp,and accurately regulated.

The invention relates to the construction and arrangement of thesupports for the car: hon-holders, whereby, as the carbon burns away,the carbon-holders are automatically adjusted to maintain the electricare at one point, as more particularly described in connection with theaccompanying drawings, wherein- Figure l is an elevation at the back ofthe lamp. Fig. 2 is a side view. Fig. 3 is a crosssection on line so 00of Fig. 1.

Similar letters of reference indicate corresponding parts.

The two metallic sides A B of the lamp are insulated by the centralportion, 0, of nonconducting material, these parts being attached upon abase, D.

The regulator (shown at E) is the Brush regulator, and is shown asconnected in a manner to permit the use of the stand as a hanging lamp.For a simple standard-lamp the regulator will be at the top, and its roda straight.

The carbon-holders I) c are attached upon racks cl 0, respectively.These racks d c are fitted in vertical slideways at opposite sides ofthe lamp, upon the metal portions A B. The holders 1) c extend at thefront, and are bent toward the center to bring their sockets I) 0 into avertical line with each other. The sockets will be formed, as usual,with clamping and adjusting screws, for holding the car bon pencils andcorrecting inequalities of burning when necessary.

fis a shaft fitted across the lamp, and having upon its outer endspinions g k, that mesh with racks (Z c. The pinions turn with the shaft,but are insulated from each other.

The rod a of the regulator is connected to rack (I, so that the movementof a will, by pinion g, turn shaft f and pinion It and move the rack e.The racks mesh with their pinions in reverse positions, whereby theirmovement is in opposite directions to bring the holders 1) c to or fromeach other.

To operate the lamp the rod to will be lifted to separate thecarbon-holders, and the carbons then put in place. The carbons are thenallowed to come together to establish a current, when they will beseparated by regulator E and adjusted thereby as required.

As the carbons burn away, the rod and upper carbon-holder descend bygravity, which movement, by the gearing described, gives an upwardmovement to the lower holder, and the electric arc is retained at thesame point at all times. By these means a reflector can be placed behindthe carbon points and the center of the are retained at the center ofthe reflector. y

In most cases it is not desirable to use a reverse current, and thepinion it will therefore have only one-half the number of teeth on 9, sothat the lower carbon-holder moves one-half the distance of the upperone.

When used as a standard-lamp the weight of the descending arm willoperate the racks, and when fitted for horizontal movement a coiledspring will be fitted to turn shaft f, as shown at it, or in any otherdesired manner.

The insulated sides permit the connectingwires to be placed at anysuitable point. It is evident that the motion of the shaft f may operatemultiple gearing.

By the above-described construction the lamp is rendered simple anddurable, and adapted for use in any position, with compen sation inevery direction, as required.

Then used as a hanging lamp, with the carbons placed horizontally, thereare no parts to cast shadows.

Having thus fully described my invention, I claim as new and desire tosecure by Letters Patent-' 1. An electric lamp having its sides A Binsulated from each other by the central portion, 0, and fitted withmovable carbon-holders, substantially as described and shown.

2 The cembination with the insulated t 0, connected with the insulatedsides A 13, plates A B of an electric lamp, of the insuand bent inwardto bring the carbons in line, lated shaft f, the spring k, pinions g h,racks as set forth.

(1 e and carbon-holders b 0 arranged for operation by the movement 0%the regulator-rod O B BEALL T a, substantially as and for the purposesspeei- Witnesses: fied. J. G. BLANGAGNIEL,

3. In an eleetrielamp, the carbon-holders V 1 JARRETI B L;

j I A I E 1 I A

